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United States Patent |
6,193,559
|
Weingartner
|
February 27, 2001
|
Jack plug
Abstract
A jack plug has a contact tip provided at the free end and followed by a
connection part which is received by a tubular shaft of the jack plug. The
contact tip with the connection part is electrically insulated from the
shaft. At the side remote of the contact tip, the shaft has a handle part
through which the connecting cable runs. The connection part which is
formed in one piece with the contact tip has a bore hole which penetrates
it over its entire length and which extends into the interior of the
contact tip. The conductor of the cable to be connected can be secured in
the interior of the contact tip by a material engagement or a positive
engagement (crimping). The portion of the bore hole located in the contact
tip is filled with a solder and, if required, with flux. A zone of the
handle part is grooved or knurled on its inner side. This zone is narrowed
in diameter by radial squeezing (crimping) after the cable to be connected
is inserted.
Inventors:
|
Weingartner; Bernhard (Feldgasse 9, A-6800 Feldkirch, AT)
|
Appl. No.:
|
275195 |
Filed:
|
March 23, 1999 |
Foreign Application Priority Data
| Mar 27, 1997[DE] | 197 12 915 |
Current U.S. Class: |
439/669 |
Intern'l Class: |
H01R 024/04 |
Field of Search: |
439/669,668
|
References Cited
U.S. Patent Documents
2610223 | Sep., 1952 | Puerner.
| |
2878459 | Mar., 1959 | Barker.
| |
3145329 | Aug., 1964 | Deakin et al.
| |
4275947 | Jun., 1981 | Takagi | 439/669.
|
4335930 | Jun., 1982 | Feldman | 439/669.
|
4938717 | Jul., 1990 | Lau | 439/669.
|
Foreign Patent Documents |
4414012 | Jun., 1995 | DE.
| |
Primary Examiner: Bradley; Paula
Assistant Examiner: Ngandjui; Antoine
Attorney, Agent or Firm: Reed Smith LLP
Parent Case Text
This application is a continuation of application Ser. No. 09/046,864,
filed Mar. 24, 1998 now U.S. Pat. No. 5,911,607.
Claims
What is claimed is:
1. A jack plug, comprising:
a contact tip provided at a free end, said contact tip having an open end
and a closed end;
a connection part following and coupled to said contact tip, said
connection part having a bore hole extending throughout its entire length
to the open end of the contact tip;
a tubular shaft of the jack plug for receiving said connection part, said
shaft and said contact tip being electrically insulated from one another,
said shaft having at a side remote of the contact tip a handle part; and
a cable extending through the shaft, the cable including a conductor
therein extending beyond the shaft and through the open end of the contact
tip, said conductor extending through the open end of the contact tip
being in material engagement with an interior of the contact tip to form a
permanent electrical connection between the conductor and the contact tip.
2. The jack plug according to claim 1, wherein the contact tip has a
constricted portion between said open end and said closed end, said
constricted portion being radially squeezed to provide said material
engagement between the contact tip and the conductor.
3. The jack plug according to claim 1, wherein the contact tip has a
constricted portion between said open end and said closed end, said
constricted portion having punctiform portions that provide said material
engagement between the contact tip and the conductor.
4. The jack plug according to claim 1, wherein said cable extends beyond
the handle part of said shaft.
5. The jack plug according to claim 1, wherein said connection part is
formed in one piece with the contact tip.
6. The jack plug according to claim 1, wherein the axial length of the
connection part corresponds to approximately half the length of the
tubular shaft.
7. The jack plug according to claim 1, wherein the handle part is formed by
a portion which follows the tubular shaft and is formed in one piece with
the shaft and is widened in diameter compared with the shaft.
8. The jack plug according to claim 1, wherein the handle part has a zone
which is grooved or knurled at its outer side.
9. The jack plug according to claim 1, wherein at least one zone of the
handle part is knurled or grooved on its inner side and said zone is
narrowed in diameter by radial squeezing after insertion of the cable.
10. The jack plug according to claim 9, wherein the zone of the handle part
provided for radial squeezing directly adjoins the tubular shaft.
Description
BACKGROUND OF THE INVENTION
a) Field of the Invention
The invention is directed to a jack plug with a contact tip which is
provided at the free end and followed by a connection part which is
received by a tubular shaft of the jack plug, wherein the contact tip is
electrically insulated from the shaft and the shaft has, at the side
remote of the contact tip, a handle part through which the connecting
cable runs.
b) Description of the Related Art
Jack plugs of this type are known in many constructional forms. All of them
share the common feature that they have a shaft with an onion-shaped
contact or contact tip provided at one end of the shaft and a handle part
at the other end of the shaft. In every case, the contact tip has a
contact needle which is received by the shaft and is electrically
insulated therefrom. The center conductor of the connecting cable is fixed
at this contact needle so as to be connected therewith in an electrically
conducting manner. For this purpose, a bore hole of short length is
provided in the contact needle at the handle end, wherein the conductor to
be connected is inserted into this bore hole. The conductor can be
connected with this bore hole in an engagement through the agency of
material or by deformation. Further, it is known to squeeze in the
conductor between the inner end of the contact needle and the insulating
sleeve enclosing the contact needle. Further, it is already known to
arrange a clamping screw at the inner end of the Contact needle, wherein
the center conductor mentioned above can be connected by means of this
clamping screw. Examples for all of these constructions are shown in the
following published materials: AT-PS 2 935; AT-PS 6 395; AT-S 22 389;
AT-PS 43 309; AT-PS 115 980; DE-PS 561 322; DE 38 34 172 A1; DE 42 27 921
A1; DE 44 14 012 C1; U.S. Pat. No. 3,656,089; U.S. Pat. No. 4,018,501;
U.S. Pat. No. 4,275,946; U.S. Pat. No. 4,275,947; U.S. Pat. No. 4,335,930;
U.S. Pat. No. 4,647,135; U.S. Pat. No. 2,878,459.
Two-pole connector plugs of the kind mentioned above, known as jack plugs
or, in English, phone plugs, originate from telephone technology and at
present are used chiefly in music electronics and electroacoustics as
economical and robust plugs in unbalanced circuits, as they are called,
e.g., electric guitars, instruments, sound pickups or electronic musical
instruments such as synthesizers and keyboards. The accompanying cable is
usually coaxial with an inner conductor of stranded wire, a rather sturdy
low-impedance insulation, preferably made from polyethylene, an outer
conductor arranged over this insulation in the form of a shielding braid
or a shielding spiral (braided shielding or spiral shielding) covered by a
plastic jacket for protecting the cable.
OBJECT AND SUMMARY OF THE INVENTION
A primary object of the invention is to provide a way for these types of
plugs, many millions of which are manufactured every year and in which
even minor reductions in cost therefore have great economic significance,
to be manufactured more economically and also connected (fastened)
substantially more quickly. A further object of the invention is to
achieve a substantial reduction in parts and a drastically simplified
assembly.
In accordance with the invention, a jack plug has a contact tip provided at
the free end and followed by a connection part which is received by a
tubular shaft of the jack plug. The contact tip with the connection part
is electrically insulated from the shaft. At the side remote of the
contact tip, the shaft has a handle part through which the connecting
cable runs. The connection part which is formed in one piece with the
contact tip has a bore hole which penetrates it over its entire length and
which extends into the interior of the contact tip. The conductor of the
cable to be connected can be secured in the interior of the contact tip by
a material engagement or a positive engagement (crimping). The portion of
the bore hole located in the contact tip is filled with a solder and, if
required, with flux, A zone of the handle part is grooved or knurled on
its inner side. This zone is narrowed in diameter by radial squeezing
(crimping) after the cable to be connected is inserted.
An embodiment example of the invention is explained more fully with
reference to the drawing, without the invention being limited to the
embodiment example shown therein.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 shows a side view of a jack plug with connected cable;
FIG. 2 shows the jack plug according to FIG. 1 in longitudinal section, but
without connected cable and without radial squeezing;
FIG. 3 shows the end of the cable prepared for connection to the jack plug;
FIG. 4 shows a longitudinal section through the jack plug as in FIG. 2, but
with inserted cable;
FIG. 5 shows a longitudinal section through the contact tip;
FIG. 6 shows a longitudinal section through the shaft with the handle part;
FIG. 7 is an oblique view of the shaft with the handle part;
FIG. 8 shows a variant;
FIG. 9 shows a cross section through a contact tip and the conductor fixed
by a positive engagement; and
FIG. 10 shows a cross section according to line X--X in FIG. 9;
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The drawings show the jack plug and its parts in a substantially larger
scale compared with the actual construction.
One end of the jack plug 1 carries a contact tip 2 which is secured by
means of the connection part 3 and with the intermediary of an insulating
sleeve 4 in the tubular shaft 5. On its side remote of the contact tip 2,
this tubular shaft 5 merges into a portion of greater diameter which
serves as a handle part 6. As can be seen particularly clearly from FIG.
6, this handle part 6 has a zone 8 which is grooved or knurled 7 on the
inside. Zone 8 is followed by another zone 9 having grooves on its outer
side. The length of the connection part 3 of the contact tip 2 is only
approximately half the length of the shaft 5. It is important that the
connection part 3 which, if required, is formed in one piece with the
contact tip 2 has a bore hole 10 which extends along its entire length
reaching into the interior of the contact tip 2 (FIG. 5). A solder and
flux, a soldering paste, are advisably introduced in the portion of the
bore hole 10 located in the contact tip 2, which is carried out in the
fabrication plant and is not shown.
It can be seen from the description above that the jack plug, according to
the invention, comprises only three parts, namely, the contact tip 2 with
the connection part 3, the insulating sleeve 4, and the shaft 5 with the
handle part 6. The shaft 5 and handle part 6 are also constructed in one
piece.
FIG. 3 shows the end of a coaxial cable 15 which is prepared for the
connection to the jack plug according to the invention. The center
stranded-wire conductor 11 is enclosed by a first insulating sleeve 12.
This insulating sleeve 12 is enclosed by a shielding braid 13 which is, in
turn, covered by the insulating jacket 14. The outer insulating jacket 14
is removed, namely, over length L, at the end of the cable to be connected
(FIG. 3) and the shielding braid 13 is then folded back so that it
contacts the portion of the outer insulating jacket shown in this Figure.
The end of the cable which is prepared in this way (FIG. 3) is now
introduced into the jack plug (FIG. 4), and the solder paste located in
the bore hole 10 of the contact tip 2 is subsequently heated by a suitable
device, and the center stranded-wire conductor 11 is accordingly connected
with the contact tip 2 through the agency of material. The device
mentioned in this connection is a kind of soldering iron which has a
corresponding shape of suitable dimensions with respect to the end or
front portion of the contact tip 2. Since the bore hole 10 projects far
into the contact tip (FIG. 5), the heat required for melting the solder
paste is conducted along the shortest path directly to the location where
it is needed without damaging the insulation. The soldering iron and
contact tip 2 need only be in contact briefly for this purpose.
Subsequently, zone 8 is deformed by squeezing together radially (crimping)
so that it narrows in diameter over its cross section (FIG. 1), wherein
the grooves 7 contact the folded back shielding braid 13 under pressure
and the required grounding contact is accordingly provided on the one hand
and, on the other hand, the cable is held in a positive engagement and in
a frictional engagement and mechanically anchored so that the required
pull-relief is provided. This electrical connection by means of crimping
and simultaneous mechanical anchoring of the cable keeps mechanical
stresses away from the solder location inside the contact tip 2. The zone
at the handle part 6 with the external grooves facilitates manipulation
and handling of the jack plug.
When a slight tensile force is exerted (toward the right in FIG. 1) on the
cable during the crimping of zone 8, the contact tip 2, insulating sleeve
4 and shaft 6 are additionally held together by this slight tensile force.
In the shown embodiment example, the handle part 6 has approximately the
same length as the shaft 5. It lies within the scope of the invention to
make the handle part 6 shorter, for example, only as long as the zone 8.
The deformations of zone 8 which are achieved by means of crimping or
squeezing then serve to facilitate handling and manipulation of the jack
plug. If needed or if desired, a sleeve of elastomer material can also be
pulled up over the handle part 6. The shaft 5 and handle part 6 are
constructed in one piece. This handle part of the jack plug fulfills three
functions: as ground contact for the cable shielding 13, as pull-relief
for the cable by means of the squeezing or crimping, and it serves
simultaneously as a handle and actuating grip. This jack plug has very few
parts; assembly and the connection of a cable are very simple. The
distance between the connected stranded-wire conductor 11 and the front of
the folded over shielding braid 13 is relatively large, so that there is a
low risk of short circuiting due to possibly loose shielding wire. The
constructional shape is extremely compact.
In the embodiment example shown in FIG. 5, the contact tip 2 and the
connection part 3 are constructed in one piece. It lies within the scope
of the invention to construct the connection part 3 as an independent
structural component part, as is shown, for example, in FIG. 8. In this
case, the connection part 3 is made of insulating material. The individual
parts can be held together in the following manner. After the end of the
wire is soldered with the contact tip 2 in the indicated manner, tension
is exerted on the wire to be connected and zone 8 is then crimped. In this
way, the wire piece between zone 8 and the contact tip 2 fulfills two
functions: this portion serves as a conductor element an the one hand and
as a connection element for the contact tip 2, connection part 3 and
handle part 6 on the other hand.
A further possibility for the connection of the stranded-wire conductor 11
and the contact tip 2 consists in that the constricted area directly
following the contact tip 2 is provided with radial crimps 16 which are
advantageously arranged in a punctiform manner along the circumference of
this constricted area. This is shown in FIGS. 9 and 10 in longitudinal
section and in cross section.
While the foregoing description and drawings represent the preferred
embodiments of the present invention, it will be obvious to those skilled
in the art that various changes and modifications may be made therein
without departing from the true spirit and scope of the present invention.
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